San Francisco–Oakland Metro Area Counties

5 counties · 4.6 million people (2025) · 2,470 sq mi

The San Francisco–Oakland metro area (officially the San Francisco-Oakland-Fremont, CA Metropolitan Statistical Area) has 5 counties in California, with 4,630,041 people in 2025. Alameda County is the most populous.

Map of the 5 counties of the San Francisco–Oakland metro area with county names and major cities
The 5 counties of the San Francisco–Oakland metro area (yellow) with the largest cities. Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).
PDF (Letter) 236 KBPNG (2400 px) 154 KB

The 5 counties of the San Francisco–Oakland metro area

Sorted by population. 4 are central counties (the urban core); the others are outlying counties tied to it by commuting.

CountyCounty seatPopulation 2025Change since 2020Land area (sq mi)Type
Alameda CountyOakland1,636,630−2.7%738Central
Contra Costa CountyMartinez1,170,070+0.4%717Outlying
San Francisco CountySan Francisco826,079−6%47Central
San Mateo CountyRedwood City743,568−2.7%449Central
Marin CountySan Rafael253,694−3.3%520Central

The metro area is part of the larger San Jose-San Francisco-Oakland, CA Combined Statistical Area.

Printable map

The PDF is a vector file for Letter paper; the PNG is 2400 pixels wide. Both are free to use with a credit to WhichCounty.

County maps of California

Other metro areas

Sources